CN106403292A - Hot-water circulation device with direct-flow pump - Google Patents
Hot-water circulation device with direct-flow pump Download PDFInfo
- Publication number
- CN106403292A CN106403292A CN201610802324.6A CN201610802324A CN106403292A CN 106403292 A CN106403292 A CN 106403292A CN 201610802324 A CN201610802324 A CN 201610802324A CN 106403292 A CN106403292 A CN 106403292A
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- Prior art keywords
- straightway pump
- water
- water flow
- pump
- flow sensor
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a hot-water circulation device with a direct-flow pump. The hot-water circulation device comprises a pipeline, the direct-flow pump and a water flow rate sensor which are installed on the pipeline, and a controller connected with the direct-flow pump and the water flow rate sensor. The hot-water circulation device is characterized in that a control method thereof comprises the following steps: 1) determining the water flow rates of the direct-flow pump during start, circulation and posterior circulation of preheating circulation of a water heater; 2) calculating corresponding frequency given values f(start), f(circulation) and f(posterior circulation) according to the relational expression f=aq of an output frequency f of the water flow rate sensor and a water flow rate q, wherein a is 10.28; and 3) carrying out closed-loop control on a running speed of the direct-flow pump by the controller according to a frequency value fed back by the water flow rate sensor and the frequency given values. According to the hot-water circulation device disclosed by the invention, the closed-loop control is carried out by virtue of the output frequency of the water flow rate sensor, and the hot-water circulation device has the characteristics of being simple to control, high in reliability, and the like. Meanwhile, posterior circulation can be carried out on the premise of restart of the water heater can be avoided through adopting the direct-flow pump, and the pipeline is high in temperature uniformity after the completion of the circulation.
Description
Technical field
The present invention relates to water heater control technology field, more particularly, to a kind of hot water circulating device with straightway pump.
Background technology
When disabling hot water, generally its burner does not work gas heater, and the water in such pipeline can be lowered the temperature cold quickly
But.For being that gas heater can release hot water at any time, generally gas heater go out hot water end and enter between cold water end plus
Dress closed circuit, and hot water circulating device of connecting on this closed circuit.
However, in existing house decoration structure, special circulation line is usually not reserved in gas heater position, leads
Cause can not carry out warm-up cycle.Though some gas heaters can serve as closed circuit using with the cold water pipe of water spot, due to mesh
Front hot water circulating device mostly adopts ac pump, and speed governing is difficult, also all adopts the rotating speed of fixation during whole warm-up cycle,
After leading to warm-up cycle, temperature homogeneity is poor.
Content of the invention
For problems of the prior art, it is an object of the invention to provide a kind of control simple, warm-up cycle after
The good hot water circulating device of temperature homogeneity.
For reaching object above, the present invention adopts the following technical scheme that.
A kind of hot water circulating device with straightway pump, including：Pipeline, the straightway pump being arranged on pipeline, discharge sense
Device, and the controller being connected with straightway pump, water flow sensor；It is characterized in that, its control method is as follows：1) determine directly
Stream pump water heater warm-up cycle startup, circulation in and metacyclic discharge；2) frequency is exported according to water flow sensor
Rate f and relational expression f=aq of discharge q calculate corresponding frequency set-point f open, f circulation, f Posterior circle, wherein a is
10.28；3) controller feeds back according to water flow sensor frequency values and the operating speed of frequency set-point closed-loop control straightway pump
Degree.Refer to start the water circulation of heater in described circulation, Posterior circle refers to not start the water circulation of heater.
As with improvement, when between the frequency values and frequency set-point of water flow sensor feedback for large deviation, adopt
Proportion adjustment changes the rotating speed of straightway pump；It is little deviation between the frequency values and frequency set-point of water flow sensor feedback
When, adoption rate integral adjustment changes the rotating speed of straightway pump.
As with improvement, the changing method between described proportion adjustment and proportional integral are adjusted is：1) set a threshold value
ε, wherein 0 ＜ ε ＜ 0.6；2) calculate difference | the E (K) | between the frequency values of water flow sensor feedback and frequency set-point, lead to
| the E (K) | that crosses this difference carries out the closed-loop control that proportion adjustment or proportional integral are adjusted to the rotating speed of straightway pump；3) as | E (K) |>ε
When, adoption rate adjusts and is controlled；4) as | E (K) |, during≤ε, adoption rate integral adjustment is controlled.
As with improvement, described hot water circulating device is arranged on water feeding of heater end, also includes temperature sensor and behaviour
Make display, described temperature sensor is arranged on pipeline, described operation display is connected with controller, by operating display
Set warm-up cycle temperature.
As with improvement, when the temperature of temperature sensor detection is less than Δ Τ with design temperature difference, passing ratio is adjusted
Increase straightway pump running speed, increase discharge, the span of described Δ Τ is 5-10 DEG C.
As with improvement, when the temperature of temperature sensor detection is less than 1 DEG C with design temperature difference, first pass through proportion adjustment
Quickly reduce straightway pump running speed, passing ratio integral adjustment slowly reduces straightway pump running speed afterwards, sample water simultaneously
The frequency values f of flow sensor feedback, makes the frequency values f and water heater initiation culture f of feedback open and meets following relation：F=f
Open-f0, the span of f0 is 6-8Hz, and f opens as 26Hz.
As with improvement, the Posterior circle time control of described straightway pump is as follows：1) duration of runs T before straightway pump Posterior circle
During ＜ 7 minutes, the Posterior circle time of straightway pump is 3 minutes；2) 11 points of 7 minutes≤T of duration of runs ＜ before straightway pump Posterior circle
Zhong Shi, the Posterior circle time of straightway pump is 4 minutes；3) during 11 minutes≤T of the duration of runs ＜ before straightway pump Posterior circle 15 minutes,
The Posterior circle time of straightway pump is 5 minutes；4), during duration of runs T >=15 minute before straightway pump Posterior circle, follow after straightway pump
The ring time is 6 minutes.
The invention has the beneficial effects as follows：
First, avoid the closed-loop control system of pump rotary speed feedback, the output frequency using water flow sensor carries out closed loop
Control, there is the features such as control is simple, and reliability is high.
2nd, adopt straightway pump, water pump realizes stepless time adjustment on the premise of less than peak power, thus reaching recirculated water
The purpose of Flow-rate adjustment, by the low-speed running of water pump, can carry out Posterior circle on the premise of avoiding water heater to restart, after
After circulation finishes, pipe temperature uniformity is preferable.
3rd, pump operation speed is suitably adjusted according to EGR real time temperature, when close to design temperature, suitably increase
Pump operation speed, increases discharge, reduces the temperature overshot phenomenon that water heater lowest temperature rise is brought, puies forward high water usage comfortableness.
4th, proportion adjustment and proportional integral adjust and are combined controlling, according to the proportional plus integral control mode of pump rotary speed
Realize water pump stepless speed control, it is to avoid speed governing overshoot causes the situation that quantity of circulating water changes greatly.
5th, the open and close of function of increasing pressure are easily realized：When user opens with water spot water, if discharge sensing
The frequency values of device feedback differ larger with frequency set-point, and the frequency values f of water flow sensor feedback meets f1<f<During f2, f1
Span is 30-35Hz, and f2 span is 40-45Hz, and adjustment pump rotary speed makes the frequency values that water flow sensor feeds back
For f2+30, supercharging is opened, and then fixes pump rotary speed.When user terminates closing water spot with water, due to the increasing of water pump load
Plus, now water flow sensor output frequency becomes big, and system controls water pump to stop, and pressurization terminates.
Brief description
Fig. 1 show the hot water circulating device control principle drawing of present invention offer.
Fig. 2 show proportion adjustment and adjusts control flow chart with proportional integral.
Specific embodiment
More fully understand the essence of the present invention for convenience of those skilled in the art, concrete to the present invention below in conjunction with the accompanying drawings
Embodiment is described in detail.
As shown in figure 1, a kind of hot water circulating device with straightway pump, including：Pipeline, be arranged on straightway pump on pipeline,
Water flow sensor, and the controller being connected with straightway pump, water flow sensor；It is characterized in that, its control method is such as
Under：
1) by the characteristic curve of straightway pump, Binding experiment test determine straightway pump warm-up cycle startup, circulation in,
And metacyclic discharge.
2) calculate corresponding frequency according to water flow sensor output frequency f with relational expression f=aq of discharge q to give
Value f opens, f circulates, f Posterior circle, and wherein a is 10.28.
3) controller feeds back according to water flow sensor frequency values and the operating of frequency set-point closed-loop control straightway pump
Speed.In the present embodiment, it is module to be occurred and is borrowed maturation by the PWM that controller carries that controller controls to direct current revolution speed
Water pump drive module come to realize, repeat no more here.
Wherein, refer to start the water circulation of heater in described circulation, Posterior circle refers to not start the water of heater
Circulation.
When between the frequency values and frequency set-point of water flow sensor feedback for large deviation, adoption rate adjusts and changes
The rotating speed of straightway pump；Avoid reducing the stability of system due to integral action, cause system overshoot to increase.When discharge sensing
When between the frequency values of device feedback and frequency set-point for little deviation, adoption rate integral adjustment changes the rotating speed of straightway pump, from
And eliminate system static difference, improve control accuracy.
As shown in Fig. 2 the changing method between described proportion adjustment and proportional integral are adjusted is：
1) threshold epsilon, wherein 0 ＜ ε ＜ 0.6 are set.Here, threshold epsilon according to the real-world operation situation of straightway pump by
Experimental test analysis determines.
2) calculate difference | the E (K) | between the frequency values of water flow sensor feedback and frequency set-point, by this difference
| E (K) | carries out the closed-loop control that proportion adjustment or proportional integral are adjusted to the rotating speed of straightway pump.
3) as | E (K) |>During ε, adoption rate adjusts and is controlled, i.e. the P shown in Fig. 2 controls.
4) as | E (K) |, during≤ε, adoption rate integral adjustment is controlled, and that is, the PI shown in Fig. 2 controls.
In varied situations, adjusted by aforementioned proportion and switching that proportional integral is adjusted just can be simple and reliable realize straight
The closed-loop control of flowing water pump.
In the present embodiment, described hot water circulating device is arranged on water feeding of heater end, also includes temperature sensor and behaviour
Make display, described temperature sensor is arranged on pipeline, described operation display is connected with controller, by operating display
Set warm-up cycle temperature.
When the temperature of temperature sensor detection is less than Δ Τ with design temperature difference, passing ratio is adjusted increases straightway pump fortune
Rotary speed, increases discharge, reduces the temperature overshot phenomenon that water heater lowest temperature rise is brought.The span of described Δ Τ is 5-
10℃.
When the temperature that temperature sensor detects is less than 1 DEG C with design temperature difference, first pass through the quick reduction of proportion adjustment straight
Flow pump running speed, passing ratio integral adjustment slowly reduces straightway pump running speed afterwards, water flow sensor of simultaneously sampling
The frequency values f of feedback, makes the frequency values f and water heater initiation culture f of feedback open and meets following relation：F=f opens-f0, and f0 takes
Value scope is 6-8Hz, and in addition f opens as 26Hz.So operation benefit be：Avoid while temperature overshot, considering the radiating of pipeline
Situation, when so that EGR Posterior circle is finished, the water temperature in whole pipeline is tried one's best close to user's design temperature.
The Posterior circle time control of described straightway pump is as follows：
1), during the duration of runs T ＜ before straightway pump Posterior circle 7 minutes, the Posterior circle time of straightway pump is 3 minutes；
2), during 7 minutes≤T of the duration of runs ＜ before straightway pump Posterior circle 11 minutes, the Posterior circle time of straightway pump is 4 points
Clock；
3), during 11 minutes≤T of the duration of runs ＜ before straightway pump Posterior circle 15 minutes, the Posterior circle time of straightway pump is 5 points
Clock；
4), during duration of runs T >=15 minute before straightway pump Posterior circle, the Posterior circle time of straightway pump is 6 minutes
Here, determine the Posterior circle time of straightway pump according to the duration of runs before straightway pump Posterior circle, carry further
The uniformity of high-temperature.
The open and close of function of increasing pressure can also easily be realized using above-mentioned hot water circulating device：Use water spot when user opens
When using water, because influent pressure is less, the frequency values of water flow sensor feedback differ larger with given frequency value.When discharge passes
The frequency values f of sensor feedback meets f1<f<During f2, it is f2+ that adjustment direct current revolution speed makes the frequency values that water flow sensor feeds back
30, supercharging is opened, and then fixes pump rotary speed.Wherein, f1 span is 30-35Hz, and f2 span is 40-45Hz.When
When user terminates closing water spot with water, due to the increase of water pump load, now water flow sensor output frequency change is big, system
Straightway pump is controlled to stop, pressurization terminates.
Above specific embodiment has been described in detail to the essence of the present invention, but can not be come to the present invention's with this
Protection domain is limited.It should be evident that under the enlightenment of present invention essence, the art those of ordinary skill also can enter
Row is many improve and modify it should be noted that these improve and modify all fall the present invention claims it
Interior.
Claims (8)
1. a kind of hot water circulating device with straightway pump, including：Pipeline, is arranged on straightway pump on pipeline, water flow sensor,
And the controller being connected with straightway pump, water flow sensor；It is characterized in that, its control method is as follows：
1) determine straightway pump water heater warm-up cycle startup, circulation in and metacyclic discharge；
2) corresponding frequency set-point f is calculated with relational expression f=aq of discharge q according to water flow sensor output frequency f
Open, f circulates, f Posterior circle, wherein a is 10.28；
3) controller feeds back according to water flow sensor frequency values and the running speed of frequency set-point closed-loop control straightway pump.
Refer to start the water circulation of heater in described circulation, Posterior circle refers to not start the water circulation of heater.
2. hot water circulating device according to claim 1 it is characterised in that when water flow sensor feedback frequency values with
When being large deviation between frequency set-point, adoption rate adjusts the rotating speed changing straightway pump；Frequency when water flow sensor feedback
When being little deviation between rate value and frequency set-point, adoption rate integral adjustment changes the rotating speed of straightway pump.
3. hot water circulating device according to claim 2 is it is characterised in that described proportion adjustment and proportional integral adjust it
Between changing method be：
1) threshold epsilon, wherein 0 ＜ ε ＜ 0.6 are set；
2) calculate difference | the E (K) | between the frequency values of water flow sensor feedback and frequency set-point, by this difference | E
(K) | the closed-loop control that proportion adjustment or proportional integral are adjusted is carried out to the rotating speed of straightway pump；
3) as | E (K) |>During ε, adoption rate adjusts and is controlled；
4) as | E (K) |, during≤ε, adoption rate integral adjustment is controlled.
4. hot water circulating device according to claim 1 is it is characterised in that described hot water circulating device is arranged on water heater
Water inlet end, also includes temperature sensor and operation display, and described temperature sensor is arranged on pipeline, described operation display
Device is connected with controller, sets warm-up cycle temperature by operating display.
5. hot water circulating device according to claim 4 is it is characterised in that work as temperature and the setting of temperature sensor detection
When temperature difference is less than Δ Τ, passing ratio is adjusted increases straightway pump running speed, increases discharge, the span of described Δ Τ
For 5-10 DEG C.
6. hot water circulating device according to claim 4 is it is characterised in that work as temperature and the setting of temperature sensor detection
When temperature difference is less than 1 DEG C, first passes through proportion adjustment and quickly reduce straightway pump running speed, passing ratio integral adjustment is slow afterwards
Reduce straightway pump running speed, the frequency values f of sampling water flow sensor feedback, makes frequency values f and the water heater of feedback simultaneously
Initiation culture f opens and meets following relation：F=f opens-f0, and the span of f0 is 6-8Hz, and f opens as 26Hz.
7. hot water circulating device according to claim 1 it is characterised in that the Posterior circle time control of described straightway pump such as
Under：
1), during the duration of runs T ＜ before straightway pump Posterior circle 7 minutes, the Posterior circle time of straightway pump is 3 minutes；
2), during 7 minutes≤T of the duration of runs ＜ before straightway pump Posterior circle 11 minutes, the Posterior circle time of straightway pump is 4 minutes；
3), during 11 minutes≤T of the duration of runs ＜ before straightway pump Posterior circle 15 minutes, the Posterior circle time of straightway pump is 5 minutes；
4), during duration of runs T >=15 minute before straightway pump Posterior circle, the Posterior circle time of straightway pump is 6 minutes.
8. hot water circulating device according to claim 1 is it is characterised in that work as the frequency values f of water flow sensor feedback
Meet f1<f<During f2, f1 span is 30-35Hz, and f2 span is 40-45Hz, and controller adjustment direct current revolution speed makes
The frequency values of water flow sensor feedback are f2+30, open waterflow boosting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802324.6A CN106403292B (en) | 2016-09-05 | 2016-09-05 | A kind of hot water circulating device with straightway pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802324.6A CN106403292B (en) | 2016-09-05 | 2016-09-05 | A kind of hot water circulating device with straightway pump |
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| Publication Number | Publication Date |
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| CN106403292A true CN106403292A (en) | 2017-02-15 |
| CN106403292B CN106403292B (en) | 2019-06-04 |
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| CN201610802324.6A Active CN106403292B (en) | 2016-09-05 | 2016-09-05 | A kind of hot water circulating device with straightway pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141865A (en) * | 2018-06-20 | 2019-01-04 | 广东万家乐燃气具有限公司 | A kind of water valve water frequency relation detection device and method |
| CN110926033A (en) * | 2019-11-08 | 2020-03-27 | 华帝股份有限公司 | Anti-sticking control method for zero-cold-water gas hot water built-in water pump |
| CN112167990A (en) * | 2020-08-18 | 2021-01-05 | 宁波方太厨具有限公司 | Temperature control method of instant heating type electric appliance |
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| CN203687329U (en) * | 2013-12-27 | 2014-07-02 | 中山市博得电器有限公司 | Forced-discharging type preheating gas water heater |
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| EP0073717A1 (en) * | 1981-08-27 | 1983-03-09 | Saunier Duval Eau Chaude Chauffage - Sdecc | Tight forced-draught burner with microprocessor regulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109141865A (en) * | 2018-06-20 | 2019-01-04 | 广东万家乐燃气具有限公司 | A kind of water valve water frequency relation detection device and method |
| CN109141865B (en) * | 2018-06-20 | 2024-05-03 | 广东万家乐燃气具有限公司 | Water valve water quantity frequency relation detection equipment and method |
| CN110926033A (en) * | 2019-11-08 | 2020-03-27 | 华帝股份有限公司 | Anti-sticking control method for zero-cold-water gas hot water built-in water pump |
| CN112167990A (en) * | 2020-08-18 | 2021-01-05 | 宁波方太厨具有限公司 | Temperature control method of instant heating type electric appliance |
| CN112167990B (en) * | 2020-08-18 | 2021-12-24 | 宁波方太厨具有限公司 | Temperature control method of instant heating type electric appliance |
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| CN106403292B (en) | 2019-06-04 |
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